/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.kie.kogito.internal.process.event;

import java.util.Collection;
import java.util.Objects;

public interface KogitoObjectListenerAware {

    default void fireEvent(String propertyName, Object oldValue, Object newValue, Runnable updater) {
        if (!Objects.equals(oldValue, newValue)) {
            if (newValue instanceof KogitoObjectListenerAware && !Objects.equals(this, newValue)) {
                ((KogitoObjectListenerAware) newValue).addKogitoObjectListener(new KogitoObjectListenerAwareListener(this, propertyName));
            }
            listeners().forEach(l -> l.beforeValueChanged(this, propertyName, oldValue, newValue));
            updater.run();
            listeners().forEach(l -> l.afterValueChanged(this, propertyName, oldValue, newValue));
        }
    }

    void addKogitoObjectListener(KogitoObjectListener listener);

    Collection<KogitoObjectListener> listeners();

    boolean isEmpty();
}
